CyberOne EC DX IOM Manual
NOTE
Consult the Copeland applications data guide for
more detailed information regarding refrigerant
line traps and line sizing.
2.6.1.3
Remote Air Cooled Condensers (AR)
If the condenser is installed above the evaporator, the
discharge line should include a P-trap at the lowest point
in the piping. The highest point in the discharge line should
be above the condenser coil and should include an inverted
trap to help prevent oil and liquid from flooding back to the
compressor during off cycles.
If the condenser is installed below the evaporator, an inverted
trap the height of the evaporator coil is required on the liquid
line to help prevent oil and liquid from flooding back to the
compressor during off cycles.
2.6.1.4
Remote Air Cooled Condensing
Units (AHU)
When installing remote condensing units above the
evaporator, the suction line should be P-trapped at the
evaporator.
When installing remote condensing units below the
evaporator, the suction line should be trapped with an inverted
trap the same height as the evaporator coil. This prevents
migration of liquid refrigerant to the compressor during off
cycles.
NOTE
Do not exceed 15 ft of vertical distance when
installing the condensing unit below the evaporator.
NOTE
All suction lines must be insulated to prevent
condensation from forming on the pipes.
2.6.2
Water/Glycol
The piping connections for water/glycol condensers are
sweat connections. Pipe sizes may not necessarily be the
same size as the unit connection. Piping should be sized to
match the required system pressure drop and pump capacity
and may require reducing fittings to match the connection
size on the air conditioner. Glycol-cooled systems with low
entering fluid temperatures should have insulated piping.
The recommended ethylene glycol solution ratio is 40%
glycol to 60% water. (STULZ recommends Dowtherm SR1
manufactured by Dow Chemical Co.) Use only ethylene glycol
with inhibitors for corrosion protection.
WARNING
Glycol is hazardous. Consult the manufacturer’s
SDS for detailed safety information.
CAUTIONS
After the interconnecting piping is installed, the
entire piping circuit must be thoroughly flushed prior
to operating the system.
When filling the chilled water, water/glycol and
optional hot water reheat loops, all air must be bled
from the piping system.
A strainer should be included in the glycol line. Once the
system is operational, the glycol mixture flows through the
strainer where any foreign objects are removed. The strainer
screen should be cleaned periodically.
2.6.3
Condensate Drain
2.6.3.1
Gravity Drain
A 7/8” O.D. copper (sweat type) line is provided to drain the
condensate pan. An S-trap is installed at the end of piping
for the installer to connect a 7/8” I.D. drain line to remove
water from the cabinet. If an optional humidifier is used, the
drain line from the humidifier is typically connected to the
condensate drain line.
During normal operation, the humidifier drain line
discharges (hot) water into the condensate drain line.
The drain line must be located so it will not be exposed to
freezing temperatures. The diameter of the drain line should
be the full size of the connection.
NOTE
Pour some water into the condensate drain pan(s)
prior to start-up. This fills the trap and prevents air
from being drawn up the drain lines.
2.6.3.2
Condensate Pump
An optional condensate pump (Figure 10) is normally factory
installed. The drain connection line is typically 1/2” I.D. vinyl
tubing or a 1/2” O.D. copper (sweat connection) may be used.
2.6.4
Humidifier
CyberOne EC systems utilize an electrode steam humidifier.
The humidifier empties into the condensate drain line during
the flush/drain cycle. A water supply line must be connected
to the ¼ in. O.D. copper tubing connection supplied by the
factory. Refer to the installation drawing supplied with your
unit for the location of the water supply connection. The
humidifier requires normal tap water for the water supply. If
the supply water is high in particulate, an external filter may
be needed.
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